Nucleating agents, radiation-sensitive compositions and photographic elements

ABSTRACT

heterocyclic N-(acylhydrazinophenyl)thioamide nucleating agents are disclosed as well as radiation-sensitive compositions and elements containing such nucleating agents in combination with silver halide grains capable of forming an internal latent image. The elements can be used to form direct-positive photographic images. Dye image transfer photographic elements are specifically contemplated. 
     A specifically preferred compound class comprised of a combination of preferred moieties can be indicated by the formula: ##STR1## wherein: A is ═N--R 2 , --S-- or --O--; 
     Q 3  is represented by the formula ##STR2## X is ═S or ═O; T 1  is ##STR3##  or --H 2  ; R 3  is an alkyl substituent: 
     R 4  is hydrogen, an alkyl, ##STR4##  or an alkoxy substituent; Z represents the non-metallic atoms necessary to complete a basic 5- or 6-membered heterocyclic nucleus of the type found in cyanine dyes having ring-forming atoms chosen from the class consisting of carbon, nitrogen, oxygen, sulfur and selenium; 
     n and d are independently chosen from the integers 1 and 2; 
     R 8  is hydrogen, phenyl, methyl, ethyl, propyl or butyl; 
     R 9  is a meta- or para-phenylene group; 
     R 2 , r 5  and R 6  are independently chosen from hydrogen, phenyl, alkyl, alkylphenyl and phenylalkyl; and 
     The alkyl moieties in each instance include from 1 to 6 carbon atoms.



